watching narrator: on this episode of "earth focus," two cies-- freetown, sierra leone, and san francislifornia vastly different turally and economically, yet facing the same struggle to adapt to rap urbanization, all set against the backdp of a dramatically changing climate. [film advance clicking]

narrator: on this episode of "earth focus," two cies-- freetown, sierra leone, and san francislifornia-- continents apart, vastly different turally and economically, yet facing the same struggle to adapt to rap urbanization, all set against the backdp of a dramatically changing climate. [film advance clicking] man: oh, no! woan: the red cross says more than 600 people are now missing and that more than 200 havekilled after heavy rain caused a severe mudslide in the west african [car horns honking] [insects chirping] amarasekaren: oo oo oo! what's happening? what's happening? no big problem, huh?pr ok. when we gelem... man: whoa! [men shouting] [indistinct conversation] narrator: while freetown residents fight for accountability, in san francisco, climate change isn't debated as much as it's igated. biions of dollars are pouring into the bay area, but is tech-driven development f prepar a sea level that's rising? scholl: san francisco is experiencing a tremendous building boom and has been for the last 5 years. tam: we have ucsf hospital. we have the warriors coming. we have a bunch of